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 ldexpl()                Convert Mantissa and Exponent into Long Double

 #include   <math.h>
 #include   <errno.h>

 long double ldexpl(m, exp);
 long double m;         Long double floating point mantissa value
 int exp;               Exponent

    ldexp() is the long double precision version of ldexp(); it converts
    the mantissa m and the exponent exp you pass into a long double
    precision floating point value, which it returns. See ldexp() for
    more information.

    Returns:    The exponential value if successful; .LHUGE_VAL
                on overflow.

 Portability:   Not supported by the ANSI standard.